Fair Value Of Financial Instruments (Schedule Of Contingent Consideration Liability) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Feb. 28, 2019	Feb. 28, 2018	Feb. 28, 2019	Feb. 28, 2018
Business Acquisition, Contingent Consideration [Line Items]
Contingent consideration liability at beginning of year			$ 4,548
Change in Fair Value	$ 52	$ 477	76	$ 652
Payments			(301)
Contingent consideration liability at end of quarter	4,323		4,323
Robert Gregory Partners, LLC [Member]
Business Acquisition, Contingent Consideration [Line Items]
Contingent consideration liability at beginning of year			606
Change in Fair Value			9
Payments
Contingent consideration liability at end of quarter	615		615
Jhana Education [Member]
Business Acquisition, Contingent Consideration [Line Items]
Contingent consideration liability at beginning of year			3,942
Change in Fair Value			67
Payments			(301)
Contingent consideration liability at end of quarter	$ 3,708		$ 3,708